Using Mysql to do multiple INSERT on linked tables

问题

I have two tables, one linked to the Primary Key of the other. At the moment I INSERT into table A, get the LAST_INSERT_ID, and then INSERT into table B.

But I have hundreds of records to insert and I want to speed things up.

In Mysql you can either:

INSERT INTO table_a (v1, v2, c3) VALUE (0, 1, 2);

INSERT INTO table_a (v1, v2, v3) VALUE (4, 5, 6);

etc, or

INSERT INTO table_a (v1, v2, v3) VALUE (0, 1, 2), (4, 5, 6), etc to add multiple entries faster - but only for one table.

Of course the latter is much faster. I was wondering whether it was possible to replicate this behaviour for my example with two linked tables using a Stored Procedure, and whether it would have a similarly dramatic improvement in performance:

something like: call special_insert((0, 1, 2), (4, 5, 6), etc); or similar.

I have no Stored Procedure experience, so I'm fishing for ideas on which direction to proceed in.

回答1:

Here is an example of a store procedure with a two table insert including Last_Insert_ID().

DELIMITER //
CREATE PROCEDURE new_person(
  first CHAR(35), last CHAR(35), email CHAR(255), tool_id INT)
BEGIN
START TRANSACTION;
   INSERT INTO person(firstname, lastname, email) 
     VALUES(first, last, email);

   INSERT INTO tasks (engineer_id, tool_id) 
     VALUES(LAST_INSERT_ID(), tool_id);
COMMIT;
END//
DELIMITER ;

CALL new_person('Jerry', 'Fernholz', 'me@somewhere.com', 1);

回答2:

After some further investigation it appears as if SP would not offer significant speed improvements and cannot accept bulk parameters like INSERT INTO

MySQL Stored Procedure vs. complex query

But I still needed to insert a fairly large number of linked records in one so I did the following:

INSERT INTO a (x, y) VALUES (1,2), (3,4), (5,6), ... (N-1, N)

id = GET_LAST INSERT_ID

ids range from id to id+N as long as we use InnoDB tables:

MySQL LAST_INSERT_ID() used with multiple records INSERT statement

http://gtowey.blogspot.com/2012/02/multi-insert-and-lastinsertid.html

and then

INSERT INTO b (a_id, z) VALUES (id,2), (id+1,4), (id+2,6), ... (id+N, 11) only gotcha is you need to know your mysql increment increment from replication.

来源：https://stackoverflow.com/questions/10075279/using-mysql-to-do-multiple-insert-on-linked-tables

标签

mysql

stored-procedures

insert

last-insert-id